MatchableClassFileTransformerDispatcher not apply on All Classes

[jsxiaoshunzi]

Description

I wrote KafkaConsumer plugin，then a very strange thing happens.
I have print out all the MatchableClassFileTransformerGuardDelegate . And I can see 'SubscriptionState' class has a MatchableClassFileTransformerGuardDelegate transformer {matcher=DefaultClassNameMatcher{org.apache.kafka.clients.consumer.internals.SubscriptionState}, transformCallback=com.navercorp.pinpoint.plugin.kafka.KafkaClientPlugin$1@3dd6db4a}
But The transformer has not been applied. (Noexception happens of course)
Similar like https://stackoverflow.com/questions/34285862/java-agent-transform-not-applied-on-all-classes

[jsxiaoshunzi]

It confused me several weeks

[jsxiaoshunzi]

As the above picture，I print out all instrument loaded class. It does contains 'SubscriptionState'.

[jsxiaoshunzi]

org.apache.kafka.clients.consumer.KafkaConsumer,/E:/Localrepository/org/apache/kafka/kafka-clients/0.10.1.1/kafka-clients-0.10.1.1.jar,sun.misc.Launcher$AppClassLoader@4145f572
org.apache.kafka.clients.consumer.internals.SubscriptionState,/E:/Localrepository/org/apache/kafka/kafka-clients/0.10.1.1/kafka-clients-0.10.1.1.jar,sun.misc.Launcher$AppClassLoader@4145f572

[Xylus]

Hi @jsxiaoshunzi
Could you check if SubscriptionState's TransformCallback.doInTransform(...) is executed? You could set a breakpoint to check, or look for the transform log (debug) for something like the following:

[DEBUG](c.n.p.p.BaseClassFileTransformer   :xx ) [transform] classLoader:sun.misc.Launcher$AppClassLoader@xxxxxxx className:org.apache.kafka.clients.consumer.internals.SubscriptionState transformer:...

Also, is it just SubscriptionState that is not being transformed? or are other kafka classes you're trying to modify not getting transformed as well?

[jsxiaoshunzi]

@Xylus
Thank you for your answer. I did put some log in SubscriptionState's TransformCallback.doInTransform().
KafkaConuser and SubscriptionState have the same classLoader. The strange things is KafkaConsumer has been transformed ,but SubscriptionState has not been transformed. The strangest things is SubscriptionState class has not enter the ClassFileTransformer,and I did find SubscriptionState has a transformer. But if I put "Class.forName(SubscriptionState )" in my agent service Code,It works fine.

[jsxiaoshunzi]

@Xylus
I give you the source code. I really can't find the bug . Thanks！

src.zip

[jaehong-kim]

@jsxiaoshunzi
Please put plugin source and test code in PR

[jsxiaoshunzi]

@jaehong-kim
Hi，It is just test case , not for others peoples's use. The phenomenon is very strange. So I ask for help

[zlp1992]

@jsxiaoshunzi Is this solved?